Everything you need to compete runs through the Devpost Codex plugin. Once installed, the plugin will guide you through each step: finding this hackathon, registering, brainstorming an idea, building your tool, and submitting. If you get stuck on what to build, lean on the plugin's ideation flow to help you land on something small and doable. Keep your build tiny; a working tool that solves one everyday problem is exactly right for this challenge.
Please refer to the instructional video and email you received from Devpost for help installing and getting started with the plugin.